Rails: ActiveSupport::MessageEncryptor::InvalidMessage

Question

Help me please, I\'ve finished 11 chapters of the rails tutorial, deployed my app to heroku (locally it worked perfectly) and it crashing all time. I\'m using rails 5.2.2 Af

Answer 1

I had this issue when working on a Rails 6 application in Ubuntu 20.04.

The issue was that I was setting/specifying a wrong RAILS_MASTER_KEY environment variable in my .env files in development (.env, .env.development). I just wanted to use it as a placeholder temporarily since I did not need it in my development environment.

This was then throwing the error below when I run a rails command, say rails generate uploader ProductImage:

`rescue in _decrypt': ActiveSupport::MessageEncry ptor::InvalidMessage (ActiveSupport::MessageEncryptor::InvalidMessage)

And even when I try generating a new master.key and the credentials.yml.enc files using rails credentials:edit or EDITOR="code --wait" bin/rails credentials:edit it throws the error below:

key=': key must be 16 bytes (ArgumentError)

Here's how to fix it:

What you have to do is to either provide the correct RAILS_MASTER_KEY environment variable in the .env file(s) or comment out the RAILS_MASTER_KEY environment variable if you are not using it.

That's it.

I hope this helps